Introduce the generic doorbell binding as well as a binding for the
Qualcomm APCS Global block. This is used to expose doorbell-like devices
in the system.
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
Changes since v2:
- New binding
.../devicetree/bindings/doorbell/doorbell.txt | 31 +++++++++++++++
.../bindings/doorbell/qcom,apcs-kpss-global.txt | 45 ++++++++++++++++++++++
2 files changed, 76 insertions(+)
create mode 100644 Documentation/devicetree/bindings/doorbell/doorbell.txt
create mode 100644 Documentation/devicetree/bindings/doorbell/qcom,apcs-kpss-global.txt
diff --git a/Documentation/devicetree/bindings/doorbell/doorbell.txt b/Documentation/devicetree/bindings/doorbell/doorbell.txt
new file mode 100644
index 000000000000..8fd814898c3f
--- /dev/null
+++ b/Documentation/devicetree/bindings/doorbell/doorbell.txt
@@ -0,0 +1,31 @@
+Doorbell binding
+============================================
+
+The doorbell binding is used to describe a set of doorbells for client blocks
+to ring.
+
+1) Doorbell controller
+----------------------
+
+A doorbell controller is a device that exposes a number of doorbells, that can
+client devices can ring to signal some event to some piece of hardware.
+
+- #doorbell-cells:
+ Usage: required
+ Value type: <u32>
+ Definition: should be 0 for single-doorbell controllers and 1 for
+ multi-doorbell controllers
+
+2) Doorbell user
+----------------
+
+- doorbells:
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: list of doorbell references
+
+- doorbell-names:
+ Usage: optional
+ Value type: <stringlist>
+ Definition: list of strings identifying each entry in the doorbells
+ property
diff --git a/Documentation/devicetree/bindings/doorbell/qcom,apcs-kpss-global.txt b/Documentation/devicetree/bindings/doorbell/qcom,apcs-kpss-global.txt
new file mode 100644
index 000000000000..6320e1a355cb
--- /dev/null
+++ b/Documentation/devicetree/bindings/doorbell/qcom,apcs-kpss-global.txt
@@ -0,0 +1,45 @@
+Binding for the Qualcomm APCS global block
+==========================================
+
+This binding describes the APCS "global" block found in various Qualcomm
+platforms.
+
+- compatible:
+ Usage: required
+ Value type: <string>
+ Definition: must be one of:
+ "qcom,msm8916-apcs-kpss-global",
+ "qcom,msm8996-apcs-hmss-global"
+
+- reg:
+ Usage: required
+ Value type: <prop-encoded-array>
+ Definition: must specify the base address and size of the global block
+
+- #doorbell-cells:
+ Usage: required
+ Value type: <u32>
+ Definition: as described in doorbell.txt, must be 1
+
+
+= EXAMPLE
+The following example describes the APCS HMSS found in MSM8996 and part of the
+GLINK RPM referencing the "rpm_hlos" doorbell therein.
+
+ apcs_glb: apcs-glb@9820000 {
+ compatible = "qcom,msm8996-apcs-hmss-global";
+ reg = <0x9820000 0x1000>;
+
+ #doorbell-cells = <1>;
+ };
+
+ rpm-glink {
+ compatible = "qcom,glink-rpm";
+
+ interrupts = <GIC_SPI 168 IRQ_TYPE_EDGE_RISING>;
+
+ qcom,rpm-msg-ram = <&rpm_msg_ram>;
+
+ doorbells = <&apcs_glb 0>;
+ };
+
--
2.12.0
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